CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '9135044259137982',cH: '8rBQJutj7RUDdAaQFcVLggB_16aRaOoKT9iNKgSTZ8Q-1739787330-1.2.1.1-YS00xNeX9vd8UrKF9SmmdL._uYzzrg2_YdMpGhHpob76DrYdCrh6PPJSNW.Ww4UH',cUPMDTk: "\/search?q=picking%20mechanism&__cf_chl_tk=IwZvp8Qt3whyU2PVK4K8tQ3zXp9ZGrC3lCYPJkM.wX8-1739787330-1.0.1.1-dNMr.E.05xim2wk3T.m5k2WzMey1ZkanTb53DyZFGQc",cFPWv: 'b',cITimeS: '1739787330',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=picking%20mechanism&__cf_chl_f_tk=IwZvp8Qt3whyU2PVK4K8tQ3zXp9ZGrC3lCYPJkM.wX8-1739787330-1.0.1.1-dNMr.E.05xim2wk3T.m5k2WzMey1ZkanTb53DyZFGQc",md: "b95FpC0j8o6aurO6MRjSWiNn3juR6eTcR8tq1m7HGFQ-1739787330-1.2.1.1-T3gPllT_QNVpRUheZvbdhd7G652lY0ZX.sQWDittpUzwOaO0CuRHv9IL22PqdkB8DDzIRPL2NSFcdhPa1._QzymBlGUGoYBFu95DqfrdHbP05bLJhyACjqr_SUGMDX8W.irfg30vB.jbiKdsXmdv_E6yrKu9wkTiuNu_DNOsbGteyEni9tBrqkZMFowW8K5BjWAGzempUV6Ij7JFNrGHgCaGHR9ronpIp4WcU8IsoqfTxviozTpyTVOeweb9ueaEDrnYzmVfZEsk1GlUWilq3ziZ1PSjrfhFMMITDHXMuTYwqqZZNpVWT96Lm2t_I9J4uEyE24L3u0GXCVAwn3fSp9tb4m1d08gWJmTWdMHks7s075Z_vPmF.Ku7CtddB_jxUsV9SWoj75N5eRYTavSafkgJO_7EEf16fvKR.t5hCo8LouGYwk9QTpBgOMCxBgPyCfMd0A9uajVWMvwMBrRtiSHlIlgJWWVetya3FaMUeNx7lCpb7KWGKJWhD7JcbyHn5MYZViafOUVnIhYWAf1tN_6EKisGtX4moAQ1WUpWU7S2wxOLfbMnm7TGtWSNzQDjgjQLyi.haL4mBxspjKl4.PWvcFtpDcYAs6JkTsxxIR9UxnbmRCgkFx2FLAury7L8Zr8ej7LrDW1xMGdKWh_9jKkdp.VQ9JDcWT9kb2c.etMR_z4SdMM64RTnfoNXa4_rDhskybiLPqxEGH8ZYelNbQgvD0aKSOvGAh73RrcPwc26fBOd2B3lHMyusv0lJ.RpMjZx_vrOCuDxR4jiQAbCQP9JRYQPV38OVcOTH.a7emZmKmC_aYCmx5ZoL20s43CPDFZH1g5fpP3L6TcRbXQdxgQgZTTMpGIKLxSEKJKeNfm1s9XCutPM1LiYB4y8FiLKdG0uXX1IHCVICZ2ptp_4WPWP6zPF5n2g_pAaHyy7QN3G0l.nn1wgezrq.NPSel6jEUDSab2SLKpnYfRvdAvaE9ldU.agJfjEt3d6AMdkbvDLw5K9J9EauZj23PLXjQkPnhwHNbJqPI.AQ0tAPE1GZfH7InlOznorckKh5Pz5.K6r8vBGQkCQXWr.emQewNer2wI5uaoN6v5Sxt_Yf2YDyRn0AjTJ2pU3g3mE1lxWsNSVWv7A7bEKZ.JR3FEZhLfbeun9NcrzyfXhMgr7erOzakBCdjdOJ842liekfVhFrIhg4tvSrgMCD_pQBzLsgGto1AAMSJyNvi6c0FO9FDg03Ose171Zib4BdKEFjcpzYPIUIyhcnesEP6Rsx53GRmNZROMDbMIDy.WN12E6OuWm_LKruOtjSk1ggWO8Uns1JVrP9RogSLGe928sXQaJqMhs.UO9ryT8zRnu9pJj3doo7gTA6hGdOK_6E_k0j9Fhk4a8OsSaBfxnai3Ym28cggaaPZFSGF1Fbi8VIEd2AzN5X6S__OfRByO6VuLGoPny87UAVHHGommN7djCvicxtcOkZdoc06DDS.69C_4K9TNWosPL6BBuo0LmZF1MxXDupjrpgPufxbRmqgIZ_M9BKq7zdTpCQ4kuKQTC.qVnN8iSHK7ygIaaZn3Og.QECn1rvSjl0TQ45n6CZtxeCVqBgqMcSWU6UGY4fXlvCk0AcqDtfQ_VOKlTQs_hdpOz0XFR34rqOXTGDpQhaeUzB195TjvxcPut.4S8kioQG1UIHpTI7_1XsPQgeY3AFUGxbxkx4SxiiczwS.nXa2B8U6fFS7QX5LF9FkRzuHNhcWP2RBqX.M_yOiaPrK68a5S23NRKvs9ZxtLYCKDNgPCxOz2V2gVYSPIuDm1wN11Q8HUd7LU9Y3GMfaZ0ap8f1U5RyRA5iGklhFEn4EyCQxNEJLHDWnHsWK1vxiA9LwEasjpcCzvoUJXj4Kopj1mmAPiOAZEJvtUP_bYSFJMhsxGLrfZDm4VKRLAHNNZvg45hnJw9RJ9SJg",mdrd: "o6u2U7lwpHELLqg3EUPDVgrh1UDWfooooQxeCbjEzC4-1739787330-1.2.1.1-J_OsiK8PdvZ4DP0rI16ctZ_WnqSnq7nkO84GQ1j8bFUYfYqC5i8M3eHAQej0FqZEtjdbpPvsbmRCHxBnSfusOs2V0ccIrVZCDFNxHe9iSECCSrLScXvMgHYTjQ0vVXFIfs0I8DMf6eNLFsCycEaAr.SzspTWeKBOhGqqDEre6P0cE_CXx7fnkDPELBmKMEjK7cd_NFIb3pyZvRWS6VooJSsxdCsXBP7tYhawoofH5nGShNOz2DUqeoyRh2zsFq9EKIfHVF50hyx1729jzFj_sfaiiJpWG2M1gskEtEkUHVpz2S2RXZUJNfHwZ0gjp5Mw1hs3sNQacUEn.QhfXAM7FIE3ctA48ffC4tpgCG1lWfGyGA6KrnPQHRtURsZuDF4gwmvoM28.mftqQOdFwtY8frj3l7RXFuimCv34X2W07Wb1hqdtLqWJY1e.zi8WLGr2IosX80s6CCe3CSckaYlN_E7V5O_YhSm2kkpNPJIdTiGX8fQqasCeqAkWlArcgs2gXzi.cl9wY2bJtvaFD1JWuZMlVxY6ABCTLv5nKOGGVkO_QaD5nN3mt_kEq.7.85thIRaRjh3SF9g2ehuKwtWII3xvKuOX_LTJiWn4NquneKJZLP0evnJ6TJYbt4UslYDCaIBAFN_Bz6LHncJhga3iPYvuBMz5cqSg2yd_jNDxFsH0S7ByV34hq1s6xcMFcGxbAU2bTr6q8up.ZamxViSTJX2hvVVkMQr9.tFecMM7pVFhIV_BFA0yO0HXvHtWprC4V4sqDlvJhQFBye9wTj8VVKy3WMCz3j1hdQNy2WpDnw3my9OTbXuXq7lTXo.qYJv0rsi.9sd7ykDk0iYvj6nmcFGpq9L7RVjmTek.5Gdxbrm3BDJODDOcgp4VPvX6n5Sg.AaTRu8oF_7pZ0Rcc.1LWqqslAKkzJz5C8tMtQELsf4NDsuY8Bs0udr4V8x9mO_x1AEL2AhB_OMuvAhMxrwQU.m3ViTUTPgXMrJFIZfrXgvPxWbpXuPTyslu4p8rA3jw0RhuHFAjoKYbwcdneO82fvyAB4Q3ymVYqS3hJaZuMcOTXqlwsQGFr.zQmDhgPz3GbN_CqZcDWNMe8WlYl13x6iydW8xsf2.7c1lCB4B4EiE.Pks45C_KrDKHnGOP9w4PQxLatEcJkMNoWI2PFjkXTWY.YjvnEG3MJPd3_2j6I2DuEyG7ecgkxJ0l1pLBfT29InUFPAr.eVoifV_9Z0QeyqZa2UY1fcaSz1xfg1vi0jiu4C.GTc9u40LGPVcBg9hGpdYIUoe7om.0MbTv9Omj09CGtssQ4lzEuW4r2cCGuAFz0fu79QhUpMnnjjyvYRbBZZW7qaM4mQehViOppS8q8L5iHgJhDlKqHhPJ72wonoSr4KQxNHSBaMPBYFluN07shhPSw8d1jIvXmPGPKfHbws5X9_8JcHV_V0Bvg6GoO3_HTEVpuDelEnUr0CKkDwzt3HWXGCKcGyKzg.ilb3jdUvE0adSXOI_DO274kW9YoBGWZQHZmWTXZyvGlvBkQuLqsdCPU045Ie2CZi1G6qTwFeGdgq5XHENgzuJhlcdgbs.Lb6PYo4rC6x6IT6dDlsSw5PbTht2obDSSfxL2KCDGFOZaAb0LQWNVYgwIy9wBu_Mwx3yMs8IZJuOCPjlhDwX9Nbq4Dp64fX_tUg9T21x1awiG0mEhCk0eud7UWRzYs.MSc37HRgIl6seQctjl6UEbtNNLsMO1Sv7RSJXCac_F2YEBs0QhWaj0Ijk5GEazYRUkxwSOxMTZGFTYOxW_V14AkSdRTHQbHN8eZGvJd2DDjMdMl_uM.E0cpG9TGzUiUWci3NoEPjIAoAYRYnD3Ppz0zRbc851RWOvrqQipAonVkeHEJTbc877hPvTd2htoaXNrTPdGzd90byVJ1gFXA6wyi5ahqafwqwVjLXYbPdF7OxdVhR5NarUfR9Yqf3.EYCsBJvJ7CvY0dr3qi4pMlcqK"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9135044259137982';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/search?q=picking%20mechanism&__cf_chl_rt_tk=IwZvp8Qt3whyU2PVK4K8tQ3zXp9ZGrC3lCYPJkM.wX8-1739787330-1.0.1.1-dNMr.E.05xim2wk3T.m5k2WzMey1ZkanTb53DyZFGQc" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>